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<meta name="description" content="面向切面编程，将横切关注点与业务代码分离，比如log，一些锁操作、全局exception处理，提高代码的模块化。  JoinPoint：方法和切入点。调用前、调用后、抛异常后等等 PointCut：拦截连接点的条件定义 Aspect：PointCut和JoinPoint的结合 Advise：通知，即要执行的部分 weave：将advise连接到对象里，并生成代理 Advisor：增强器  AopN">
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<meta property="og:description" content="面向切面编程，将横切关注点与业务代码分离，比如log，一些锁操作、全局exception处理，提高代码的模块化。  JoinPoint：方法和切入点。调用前、调用后、抛异常后等等 PointCut：拦截连接点的条件定义 Aspect：PointCut和JoinPoint的结合 Advise：通知，即要执行的部分 weave：将advise连接到对象里，并生成代理 Advisor：增强器  AopN">
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<meta name="twitter:description" content="面向切面编程，将横切关注点与业务代码分离，比如log，一些锁操作、全局exception处理，提高代码的模块化。  JoinPoint：方法和切入点。调用前、调用后、抛异常后等等 PointCut：拦截连接点的条件定义 Aspect：PointCut和JoinPoint的结合 Advise：通知，即要执行的部分 weave：将advise连接到对象里，并生成代理 Advisor：增强器  AopN">



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        <p>面向切面编程，将横切关注点与业务代码分离，比如log，一些锁操作、全局exception处理，提高代码的模块化。</p>
<ul>
<li>JoinPoint：方法和切入点。调用前、调用后、抛异常后等等</li>
<li>PointCut：拦截连接点的条件定义</li>
<li>Aspect：PointCut和JoinPoint的结合</li>
<li>Advise：通知，即要执行的部分</li>
<li>weave：将advise连接到对象里，并生成代理</li>
<li>Advisor：增强器</li>
</ul>
<h2 id="AopNameSpaceHandler"><a href="#AopNameSpaceHandler" class="headerlink" title="AopNameSpaceHandler"></a>AopNameSpaceHandler</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">AopNamespaceHandler</span> <span class="keyword">extends</span> <span class="title">NamespaceHandlerSupport</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">	<span class="comment">/**</span></span><br><span class="line"><span class="comment">	 * Register the &#123;<span class="doctag">@link</span> BeanDefinitionParser BeanDefinitionParsers&#125; for the</span></span><br><span class="line"><span class="comment">	 * '&#123;<span class="doctag">@code</span> config&#125;', '&#123;<span class="doctag">@code</span> spring-configured&#125;', '&#123;<span class="doctag">@code</span> aspectj-autoproxy&#125;'</span></span><br><span class="line"><span class="comment">	 * and '&#123;<span class="doctag">@code</span> scoped-proxy&#125;' tags.</span></span><br><span class="line"><span class="comment">	 */</span></span><br><span class="line">	<span class="meta">@Override</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">init</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="comment">// In 2.0 XSD as well as in 2.1 XSD.</span></span><br><span class="line">		registerBeanDefinitionParser(<span class="string">"config"</span>, <span class="keyword">new</span> ConfigBeanDefinitionParser());</span><br><span class="line">		registerBeanDefinitionParser(<span class="string">"aspectj-autoproxy"</span>, <span class="keyword">new</span> AspectJAutoProxyBeanDefinitionParser());</span><br><span class="line">		registerBeanDefinitionDecorator(<span class="string">"scoped-proxy"</span>, <span class="keyword">new</span> ScopedProxyBeanDefinitionDecorator());</span><br><span class="line"></span><br><span class="line">		<span class="comment">// Only in 2.0 XSD: moved to context namespace as of 2.1</span></span><br><span class="line">		registerBeanDefinitionParser(<span class="string">"spring-configured"</span>, <span class="keyword">new</span> SpringConfiguredBeanDefinitionParser());</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Override</span></span><br><span class="line">	<span class="function"><span class="keyword">public</span> BeanDefinition <span class="title">parse</span><span class="params">(Element element, ParserContext parserContext)</span> </span>&#123;</span><br><span class="line">		AopNamespaceUtils.registerAspectJAnnotationAutoProxyCreatorIfNecessary(parserContext, element);</span><br><span class="line">		extendBeanDefinition(element, parserContext);</span><br><span class="line">		<span class="keyword">return</span> <span class="keyword">null</span>;</span><br><span class="line">	&#125;</span><br></pre></td></tr></table></figure>

<p>定义了解析开启Aop标签的BeanDefinitionParser，这里关注<strong>aspectj-autoproxy</strong>解析器。这里注册创建了AnnotationAwareAspectJAutoProxyCreator，是AOP主要的逻辑实现所在。</p>
<h3 id="注册or升级BeanDefinition"><a href="#注册or升级BeanDefinition" class="headerlink" title="注册or升级BeanDefinition"></a>注册or升级BeanDefinition</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">private</span> <span class="keyword">static</span> BeanDefinition <span class="title">registerOrEscalateApcAsRequired</span><span class="params">(Class&lt;?&gt; cls, BeanDefinitionRegistry registry, Object source)</span> </span>&#123;</span><br><span class="line">		Assert.notNull(registry, <span class="string">"BeanDefinitionRegistry must not be null"</span>);</span><br><span class="line">		<span class="keyword">if</span> (registry.containsBeanDefinition(AUTO_PROXY_CREATOR_BEAN_NAME)) &#123;</span><br><span class="line">			BeanDefinition apcDefinition = registry.getBeanDefinition(AUTO_PROXY_CREATOR_BEAN_NAME);</span><br><span class="line">			<span class="keyword">if</span> (!cls.getName().equals(apcDefinition.getBeanClassName())) &#123;</span><br><span class="line">				<span class="keyword">int</span> currentPriority = findPriorityForClass(apcDefinition.getBeanClassName());</span><br><span class="line">				<span class="keyword">int</span> requiredPriority = findPriorityForClass(cls);</span><br><span class="line">				<span class="keyword">if</span> (currentPriority &lt; requiredPriority) &#123;</span><br><span class="line">					apcDefinition.setBeanClassName(cls.getName());</span><br><span class="line">				&#125;</span><br><span class="line">			&#125;</span><br><span class="line">			<span class="keyword">return</span> <span class="keyword">null</span>;</span><br><span class="line">		&#125;</span><br><span class="line">		RootBeanDefinition beanDefinition = <span class="keyword">new</span> RootBeanDefinition(cls);</span><br><span class="line">		beanDefinition.setSource(source);</span><br><span class="line">		beanDefinition.getPropertyValues().add(<span class="string">"order"</span>, Ordered.HIGHEST_PRECEDENCE);</span><br><span class="line">		beanDefinition.setRole(BeanDefinition.ROLE_INFRASTRUCTURE);</span><br><span class="line">		registry.registerBeanDefinition(AUTO_PROXY_CREATOR_BEAN_NAME, beanDefinition);</span><br><span class="line">		<span class="keyword">return</span> beanDefinition;</span><br><span class="line">	&#125;</span><br></pre></td></tr></table></figure>

<h3 id="处理target-class和expose-proxy"><a href="#处理target-class和expose-proxy" class="headerlink" title="处理target-class和expose-proxy"></a>处理target-class和expose-proxy</h3><p>把proxy-target-class和expose-proxy放到beanDefinition的属性里。</p>
<ul>
<li>proxy-target-class：Spring默认是基于jdk的动态代理，jdk的动态代理是通过接口实现的，运行时生成接口的实现类来完成对目标的代理。CGLib则支持对类进行代理，通过生成子类的方式来实现。</li>
</ul>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">useClassProxyingIfNecessary</span><span class="params">(BeanDefinitionRegistry registry, Element sourceElement)</span> </span>&#123;</span><br><span class="line">		<span class="keyword">if</span> (sourceElement != <span class="keyword">null</span>) &#123;</span><br><span class="line">			<span class="keyword">boolean</span> proxyTargetClass = Boolean.parseBoolean(sourceElement.getAttribute(PROXY_TARGET_CLASS_ATTRIBUTE));</span><br><span class="line">			<span class="keyword">if</span> (proxyTargetClass) &#123;</span><br><span class="line">				AopConfigUtils.forceAutoProxyCreatorToUseClassProxying(registry);</span><br><span class="line">			&#125;</span><br><span class="line">			<span class="keyword">boolean</span> exposeProxy = Boolean.parseBoolean(sourceElement.getAttribute(EXPOSE_PROXY_ATTRIBUTE));</span><br><span class="line">			<span class="keyword">if</span> (exposeProxy) &#123;</span><br><span class="line">				AopConfigUtils.forceAutoProxyCreatorToExposeProxy(registry);</span><br><span class="line">			&#125;</span><br><span class="line">		&#125;</span><br><span class="line">	&#125;</span><br></pre></td></tr></table></figure>

<h2 id="创建AOP代理"><a href="#创建AOP代理" class="headerlink" title="创建AOP代理"></a>创建AOP代理</h2>
      
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